A closed-cell, polymer foam designed to meet the demanding requirements of high-volume industrial sandwich part production. The foam has a high elongation at break and shows good impact and fatigue properties. It can be formed at room temperature to simple shapes as well as thermoformed to complex 3- dimensional parts. The elevated temperature resistance allows short processing cycles with fast curing resin systems, including thermoplastic fibre reinforced skins (GMT) making it very suitable for mass-produced light-weight sandwich structures subjected to both static and dynamic loads in service.